[Java] Strategy pattern

Verification environment

Source code


package designpattern;

public class StrategySample {
	public static void main(String[] args) {
		say(new Dog());
		say(new Cat());

	private static void say(Animal animal) {


package designpattern;

public class Dog implements Animal {

	public void say() {



package designpattern;

public class Cat implements Animal {

	public void say() {



package designpattern;

interface Animal {

	void say();


This is what the Strategy pattern is, right? This is a code that often appears in the introduction of so-called polymorphism. This is because I have met many times at work without learning I could understand it easily.

It's the same as putting a HashMap in a Map

See you again (^_^) Noshi

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